Title：An operational amplifier of AB class output level based on double feedback structure

Country：中国

Patent No.：201310284797.8

Legal Status：Authorized

Inventor：Baoyong Chi, Xinwang Zhang, Zhihua Wang

Assignee：Tsinghua University

Address：Mailbox No. 82, Beijing 100084

Filing Date：2013-07-08

Issue Date：2017-05-24

The invention discloses an operational amplifier of an AB class output stage based on a duplex feedback structure. The operational amplifier comprises an input class circuit, an output class circuit, a common mode feedback circuit and the duplex feedback structure. A method of combining the feedback structure and a feed-forward structure is adopted, so that extension of the bandwidth of the operational amplifier is achieved, and the enough phase margin is ensured. The AB class output stage is adopted, and therefore the driving capability of the operational amplifier is improved. The operational amplifier can work under low power voltage (smaller than 1.2 V) and has the advantages of being wide in bandwidth, low in power consumption and high in driving capability.

Patent Certificate： PDF/Jpg